Combination bit and rotary underreamer.



.L S. CAMPBELL & J. GRANT,

COMBINAHON BIT AND ROTARY UNDERREAMER. APPLICATION FILED NOV.13. m5.

1,169,922. Patented Feb. 1, 1916.

UNITED STATES PATENT OFFICE.

LAWRENCE s. CAMPBELL. or LOS ANGELES, AND JOHN GRANT, or FLORENCE, camronnm.

communion BIT Ann some! nnnsnnnamnnag tai Specification of Letters Patent.

Patented Feb. 1, 1916.

Application filed November 13, 1915. Serial No. 61,309.

. r' i To alt whom it may concern Be it known that we, Lawnnxor: S. CAMP- BELL and JOHN Guam, sub ects of the King of Great Britain, residing, respectively,'at

Los Angeles, in the county of Los Angeles and State of California, and at Florence, in the county of Los Angeles andState of California, have invented new and useful Improvements in Combination Bit and Rotary cross section on line 6-?) of Fig. Fig.

combination, and arrangement of devices hereafter more fully described and claimed. and illustrated in the accompanying draw- 1ng,'in Wh1Cl1-- Figure l is a front view of our device, the

' outer shell shown in section. Fig. 2 is a side view, the shell also in section. Fig. 3 is a cross section on line a-c of Fig. 1. Fig. 4 is a single cutter. Fig. is the top oi Fig. l with a locking key inserted. Fig. (i is 4 is a slight modification of the locking device. a pin inserted for-the locking key. Fig. s

is the lower end of a well-casing Constructed for using our device for rotary drilling.

Similar nuinbersrcfer to similar parts throughout. the several views.

Numeral 1, see Fig. 1, indicates the lower end of a working shell in well-work. The

, shelll is provided with a concentric bore 2 into which all the operating parts of my de- Vice are inserted. Near the termination ot the bore 2, a projection 3 is left in the bore 2,

to engage with a. groove 4: in the center-block 5. Projections 3 and grooves 4' can be had in a suitable number, as will easily be understood, two being shown on the drawing, but one will usually be suficient, as it serves only to keep the center-block in position in the-bore.

grooves 4, the center-block is cut down toa flattened shaft 6; farther to the lower end A suitable distance below the this shaft is cut out more yet, to receive the nearly semi-circular shanks 7 of the cutters 8; and to the lowest end of the flattened sl'iaft, lugs 9 are provided on the opposite sides to prevent the cutters 8 from falling out, in case of a break in the operating rods 10. The Fig. 3 is a sect-ion just above thc top ends ofthe operating rods 10. showing these rods in the spaces left between thc shclll and the flattened shaft (3; it also shows a concentric bore 11, which is provided concentrically inside of the flattened shaft torcccire a spring 12. The bore 11 also forms. in the flattened sides of the ccntcr-block, slots 33, through which the operating rods are inserted to engage with the springs 12. The lower ends of the operating rods are t-urnably riveted in the holes 13 ot' the cutters 8. The tension of the springs 12 thus pulls the cutters 8 into the shell by the operating rods 10.

'lheshanks't'of thccuttcrsS arc constructml to form strong counter-levers and pounding surfaces. As the shell 1 forms a full ringend, the cutters are provided with shoulders H to utilize this ring. forming a propow tional large pounding.surtacc. The tilting= moment, caused by the cutting pressure against the cutting edge 15 of thc cutters is countcrlmlanccd by the resistance in the long surface along the cdgedfl oi the shanks T. The opposite edge is termed to prevent the'cuttcrs from collapsing. the edges 17 and 1'8 ot' the shank 7, see Fig. 4. engaging with the projections 19 and 20 on the flattened shaft 6. see Fig. 1'. To make the cutters collapse. as indicated in dotted lines at 21*. see Fig. 1. tll( .(lllttl'fi have to be pulled outof the shell l far enough to disengage the edges 17 and 18 of the shank T from the projections 19 and 20. the pulling being done against the tension of the spring 12. For taking our reamer apart, in this collapsed posit-ion, the whole operating parts, cuttershanks and center-block, can be pushed in, a

suitable distance to bring the projection 3 in the shell 1. to the horizontal-part of the groove 4, along which it can be turned to the vertical part of the groove. which is open to the upper end of the center-block 5.

To prevent a disengaging while operating with our reamer in av well, we provide j a locking key as shown in Figs. Fraud 6. The key :21 is a straight fiat steel bar, inserted into a slot 22, which is cut through the whole thickness of. through the shell. 'lhokey 21 naturallywill the. center-block. but

always l'all down to loclc the projections of the shell thin the groove l of the centerblock. and this can only be unlocked by turniniL -tho whole reamorupsitlo-dt'nvn.

.\ slightu'iodilioation oi our locking (lo-1 rice is shown in Fig. 1'. whoroa pin 25 is provided through the shell and center-block.

The pin .23 is provided with a projettion 21'). which can be inserted through a notch 27 in the washer is. The Ptnjtt'tltttl 2 natu- .t"all turns down by its own gravity and locks the pin behind the washer 2*.

The

washer is riveted in on the edges 2 At the opposite side of the shell 1. a small bore t: is provided to drive the pin 25 out.

For using our device as a rotary reamor, we provide the lower end 30 ot' a well- .casing with cut outs :23. see Fig. H, to fit over our cutters 8. The lower end of the well-casing being: usually the shoe and ot' thicker tnotal. we provide channels 24 on tho' inside of these s-'hoes to allow water to pass through to the cutting edges 15.

For the case of a break in tho operating; rods--1 the cutters Karo provided with a recess Ill. see Fifi. 4. to engage with the lugs i on the lower end of tho center-block. see

hollow at the upper end and llattenod to tho lower end and ha\'|n a recess formed on the outside of the upper round end adapted to ongago with the projection in the bore of the shell. cutters haring shanks formed on the upper ends designed to lit in the noal'l Semi-circular spacoslct t on both sides of tho contor-hlm-k in tho shell. a spring inserted intotho hollow eontor-block. and operating rods with tho lower ends turnahly socurod to tho shanks of tho cuttors and on'g'ag'ing' with tho upper ends with tho spring in tho contor-block adapted to hold the cutters in operating position,

L. dovice for tho purpose described. consisting ot a hollow shell. u center-block roliora al secured in tho shell, cutters slidiu 'l mounted intho space formed between the center block and tho shell. and a wellcasing' being cnt out at tho lowertermination to in over tho cutters designed for rotary chilling and having grooves provided along the insidoot' tho lowor thicker end in the casing atlapt-odito allow water to pass to tho cutters.

t. device for-the purp( described, consistingof a shell being hollow an'l terminot having: shanksformed on the upper ends slidinglv fitting in the nearly semi-circular spaces formed on both sides of the flattened center-block in tho shell and having shoul- (let's to utilize tho ring-termination of the shell for a pounding surface, the cutters ha rin cutting edges on the lower end eccentric to the center ot'the device and a straight resisting 'shank on the upper end parallel to thecenter of the device opposite to the cutting edges. opposite to the straight resisting sh'ank and on the same side with the cutting edges the shank is formed to engage with the projections on the center-block adapted to prevent the cutters from col lapsing. and operating means secured to the cutters adapted to'hold the cutters in 01)- crating position. i I

t. In a device for the purpose described, a hollow shell. a center-block removably secured in the shell heingtlattened atthe lower end. cutters slidingzly mounted in the spaces formed hetwoen -the flattened center-block and tlteslt-oll. said center-block having lugs formed on the termination of the flattened end. and said cutters having recesses formed on tho sides toward the center-block adapted to engage with the lugs on the center-block to prevent the cutters from falling out.

device for the purpose described, a hollow. shell. a center-block l'etnovably secured in the shell being-flattened at the lower end. cutters slidingzly mounted in the spaces formed between the flattened center-block and the shell. said ce11ter l)l0cl terminating below the shell having means thereon to prevent the cutters from collapsing and also adapted to serve as a gulde to bring the cutters into operating position. and operating means secured to the cutters adapted to hold the cutters in operating position, all substantially as described.

t'. In a device for the purpose described consisting of a hollow shell. a center-bloek romorahlr secured in theshell-being flattoned at the lower end. said center-block being also provided with aslot crosswise through the upper end. cutters slidingly mounted in the spaces formed between the ilattenod center-block and the shell. and operating means secured to the cutters and.

suitably supported by the center-block adapted to hold the cutters in operating po ,sition. the combination of a lockin; key

inserted through the slot in said center- 'hlock adapted to provent'a disengaging of said shell and center-block.

T. In. a device .t'or the purpose described In testimony whereof We hereunto aflix 1C- onr slgnatures 1n the presence of two .Wltnesses.-

LAWRENCE s. CAMPBELL. JOHN GRANT.

*itnesses:

ARTHUR M. OLSON, Enw. WATKms. 

